Locked in my room, I opened the first book of three books that my teacher had left me, it was a carefully crafted book, its cover was made of leather and the letters with the name of the book were written with gold.
When I opened it, it looked like an anatomy book, specific for a humanoid demon, the first part was simple, where each organ was, its functions, which were vital organs and how long it would take to die when losing a vital organ, and the possibilities of replacing or restoring them.
